The idea that late game performance has no bearing on a player's performance is just laughable.

Nobody said that. It's only a very small part of the overall picture, though, especially when you are as dominant as LeBron is in every aspect of the game and your team blows out playoff opponents often largely due to your dominance.

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It is absolutely homerism to look at the average playoff schedule he played, the lack of clear defining late game moments, and the kind of legendary historical performances you're measuring him up against and suggest that it was one of the best of all time.

No, it's actually just citing statistics that suggest that LeBron had one of the greatest postseason runs in the history of the game. He completely carried the Heat to the title while posting near triple doubles every night on high percentages with elite defense. That just doesn't happen that often (see here: http://www.basketball-reference.com/..._top_10_p.html)